Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment securities available-for-sale [Abstract]
Amortized cost	$ 424,981	$ 340,706
Unrealized gains	10,473	3,131
Unrealized losses	(374)	(940)
Estimated fair value	435,080	342,897
Gross realized gains from sales/calls of available-for-sale securities	342	81	$ 0
Gross realized losses from sales or calls of available-for-sale securities	46	84	$ 20
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	37,910	42,667
Unrealized gains	982	601
Unrealized losses	(1)	(13)
Estimated fair value	38,891	43,255
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	105,506	53,525
Unrealized gains	1,317	433
Unrealized losses	(265)	(46)
Estimated fair value	106,558	53,912
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	31,013	26,311
Unrealized gains	1,878	749
Unrealized losses	(9)	(29)
Estimated fair value	32,882	27,031
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	71,531	79,470
Unrealized gains	1,937	349
Unrealized losses	(8)	(399)
Estimated fair value	73,460	79,420
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	179,021	138,733
Unrealized gains	4,359	999
Unrealized losses	(91)	(453)
Estimated fair value	$ 183,289	$ 139,279

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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